<template>
	<view>
		<view class="search-box">
			<uni-search-bar :radius="100"  @input="input" cancel-button="none" @clear="clearSearch"></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !==0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">
					{{item.goods_name}}
				</view>
				<uni-icons type="arrowright" size="16"></uni-icons>

			</view>
		</view>
		
		<!-- 搜索历史 -->
		<view class="history-box" v-else>
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
				
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				  <uni-tag :text="item" v-for="(item,i) in histories" :key="i" @click="gotoGoodsList(item)"></uni-tag>
			</view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				timer:null,
				kw:'',
				searchResults:[],
				//搜索历史的数组
				historyList:[]
			}
		},
		methods: {
			//input输入事件的处理函数
			input(e){
				clearTimeout(this.timer)
				this.timer = setTimeout(() =>{
					this.kw = e
					this.getSearchList()
				},500)
			},
			async getSearchList(){
				//判断搜索关键词是否为空
				if(this.kw.length === 0){
					this.searchResult = []
					return 
				}
				
				const {data: res} = await uni.$http.get('/api/public/v1/goods/qsearch',{query:this.kw})
				// console.log(res)
				if(res.meta.status !==200 )return uni.$showmsg()
				
				this.searchResults = res.message
				
				this.saveSearchHistory()
				
			},
			gotoDetail(item){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id='+item.goods_id
				})
			},
			saveSearchHistory(){
				//this.historyList.push(this.kw)
				// 解决关键词重复问题
				const set = new Set(this.historyList)
				 set.delete(this.kw)
				 set.add(this.kw)
				 this.historyList = Array.from(set)
				
				//对搜索历史数据进行持久化的存储
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
				
				
			},
			clearSearch() {
			  this.kw = '';          // 清空搜索关键词
			  this.searchResults = []; // 清空搜索结果
			  clearTimeout(this.timer); // 清除定时器
			  this.timer = null;
			  //this.loadHistory();      // 重新加载历史记录
			},
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
			gotoGoodsList(kw){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query=' + kw
				})
			}

		},
		computed: {
			histories(){
				return [...this.historyList].reverse()
			}
		},
		onLoad(){
			this.historyList = JSON.parse(uni.getStorageSync('kw') || '[]')
		}
	}
</script>

<style lang="scss">
	.search-box {
		position: sticky;
		top: 0;
		z-index: 999;
	}
	.sugg-list {
		padding: 0 5px;
		.sugg-item {
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			display: flex;
			align-items: center;
			justify-content: space-between;
			
			.goods-name {
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
				margin-right: 3px;
			}
		}
	}
	.history-box{
		padding: 0 5px;
		.history-title{
			display: flex;
			justify-content: space-between;
			height: 40px;
			align-items: center;
			font-size: 13px;
			border-bottom: 1px solid #efefef;
		}
		.history-list{
			display: flex;
			flex-wrap: wrap;
			.uni-tag{
				margin: 0 5px;
			}
			
		}
	}
</style>
